CN202383039U

CN202383039U - Cylinder for SDI (silt density index) tester

Info

Publication number: CN202383039U
Application number: CN2011205665342U
Authority: CN
Inventors: 刘大伟; 田旭峰
Original assignee: 田旭峰
Current assignee: United Tech (Beijing) Environmental Technology Co., Ltd.
Priority date: 2011-12-30
Filing date: 2011-12-30
Publication date: 2012-08-15
Anticipated expiration: 2021-12-30

Abstract

A cylinder for an SDI (silt density index) tester comprises a front end cover, a rear end cover, a cylinder barrel, a piston, an air inlet and an air outlet, wherein the air inlet and the air outlet are arranged on the cylinder barrel, two ends of the cylinder barrel are in airtight connection with the front end cover and the rear end cover respectively, the piston is slidably arranged in the cylinder barrel, one end of a piston rod is connected with the piston, the other end of the piston rod extends out of an opening hole of one of the front end cover and the rear end cover, and the piston rod is in airtight connection with the opening hole. The cylinder for the SDI tester is characterized by further comprising two groups of sensors, the sensors are mounted on the periphery of the cylinder barrel, and the sensors in one group are arranged on the upper limit position, for realizing operation of the SDI tester, of the piston while the sensor in the other group are arranged on the lower limit position, for realizing operation of the SDI tester, of the piston.

Description

A kind of cylinder of SDI tester

Technical field

The utility model relates to a kind of cylinder, in particular for the employed cylinder that plays sealing function in SDI silt density index (SDI) in the sewage disposal system (the SDI one Silt Density Index) tester.

Background technology

Pollution index (SDI) value also is referred to as FI (Fouling Index) value, is one of important parameter of water-quality guideline; It has characterized particle in the water, colloid and other can block the content of the object of various water purification equipments; Through measuring the SDI value, can select corresponding desalt technology or equipment, in the reverse osmosis water processing procedure; The SDI value is one of important indicator of measuring the counter-infiltration system water inlet, is the main the means whether water outlet of check pretreatment system reaches the feed water by reverse osmosis requirement.

Cylinder is the sealing mechanism of SDI tester in the SDI tester, and the cylinder of common in the market SDI tester is because mechanical wear causes the transmission accuracy reduction, and motion state worsens, even causes inefficacy; In the work of SDI tester, the run location of cylinder is uncertain, and program can only be judged lasting test; Worsen when transmission accuracy reduces motion state, when cylinder moves downward, do not run to assigned address; Test is proceeded, and then can produce leakage, makes the serious deviation of test data; When cylinder moves upward, do not run to assigned address, program can continue to change film, can pull apart the film volume and make equipment can't continue test; Like this, not only can't guarantee measuring accuracy but also cause mechanical disorder easily, become urgent problem.

Summary of the invention

The purpose of the utility model is to overcome above-mentioned deficiency, provides a kind of simple in structure, and controllability is strong, guarantees measuring accuracy, reduces the cylinder of the SDI tester of mechanical disorder.

The utility model is achieved in that a kind of cylinder of SDI tester, comprises front end end cover, rear end cap, cylinder barrel, piston, air intake opening and gas outlet, and said air intake opening and gas outlet are located on the cylinder barrel; The cylinder barrel two ends are tightly connected with front end end cover, rear end cap respectively; Piston is located in the cylinder barrel slidably, and piston rod one end is connected with piston, stretches out in the perforate of one of other end the past, rear end cap; Piston rod and described perforate are tightly connected; It is characterized in that, also comprise sensor, said sensor is two groups and is installed at cylinder barrel peripheral; Wherein one group is arranged on the upper limit that piston satisfies the work of SDI tester, and another group is arranged on the lower limit that piston satisfies the work of SDI tester.

Further, said piston is provided with sensing element.

Further, said sensor is an electromagnetic induction sensor.

Cylinder is the sealing mechanism of SDI testing filters, is connected with operated pneumatic valve with the gas outlet through air intake opening, and said sensor connects the PLC of servocontrol operated pneumatic valve through output line; Sensor is to belong to electromagnetic induction, and the material of piston is an irony, when position of piston arrives set point; Sensor sensing is to the magnetic of piston; Send signal and give PLC, PLC just can judge that cylinder has run to assigned address, and if warp (is set at 10 seconds) after a while usually; PLC does not receive the feedback signal that comes from sensor, thereby judges that then operation is in abnomal condition and stops test process to avoid causing the total failure of equipment.

The beneficial effect of the utility model shows as:

1, whether the utility model runs to the position of satisfying the work of SDI tester through the piston in the sensor monitors cylinder; And then by the running of PLC control SDI tester; Guarantee the testing precision of SDI tester; Avoid the SDI tester by the mechanical disorder that cylinder brings, improved work efficiency, be providing safeguard smoothly of engineering project.

2, the utility model need not carry out special transformation to cylinder, and is simple in structure, easily processing.

Description of drawings

Fig. 1 is the utility model easy structure synoptic diagram:

Wherein: sensor-1; Cylinder barrel-2; Piston-3; Air intake opening-4; Gas outlet-5; Sensing element-6; Piston rod-7.

Embodiment

Below in conjunction with accompanying drawing the utility model is further specified.

A kind of cylinder of SDI tester comprises front end end cover, rear end cap, cylinder barrel 2, piston 3, air intake opening 4 and gas outlet 5, and said air intake opening 4 is located on the cylinder barrel 2 with gas outlet 5; Cylinder barrel 2 two ends are tightly connected with front end end cover, rear end cap respectively; Piston 3 is located in the cylinder barrel 2 slidably, and piston rod 7 one ends are connected with piston 3, stretches out in the perforate of one of other end the past, rear end cap; Piston rod 7 is tightly connected with described perforate; It is characterized in that, also comprise sensor 1, said sensor 1 is two groups and is installed in cylinder barrel 2 peripheries; Wherein one group is arranged on the upper limit that piston satisfies the work of SDI tester, and another group is arranged on the lower limit that piston satisfies the work of SDI tester.

Further, said piston 3 is provided with sensing element 6.

Further, said sensor 1 is an electromagnetic induction sensor.

The utility model need not transformed cylinder, and when the material of piston 3 was irony, used sensor 1 was an electromagnetic induction sensor; When the material non iron of piston 3, on piston 3, be provided with sensing element 6, used sensor 1 is the sensor supporting with sensing element; Because the described sensor 1 of the utility model is noncontact class sensor, so sensor 1 can be installed on the cylinder barrel 2 as required flexibly, comprise that screw thread fixes, the clip clamping is pasted and is connected with support.

Cylinder is the sealing mechanism of SDI testing filters, is connected with operated pneumatic valve with gas outlet 5 through air intake opening 4, and said sensor 1 connects the PLC of servocontrol operated pneumatic valve through output line; The mechanism that a clamping diaphragm is arranged in the water route round-robin process in the SDI tester, after moving the film end certainly, cylinder falls the water that seals up in the water route; Power section is controlled operated pneumatic valve by PLC; Impel piston 3 to move up and down, compress diaphragm when moving downward and seal, when upwards lifting; Diaphragm is changed, and has so just realized being sealed or being changed by PLC control pneumatic part the effect of diaphragm; When the position of piston 3 arrived set point, sensor 1 was sensed the magnetic of piston 3, sent signal and gave PLC, and PLC just can judge that cylinder has run to assigned address, continues operation; And if through (being set at 10 seconds usually) after a while, PLC does not receive the feedback signal that comes from sensor 1, thereby judge that then operation is in abnomal condition and stops test process to avoid causing the total failure of equipment.

Claims

1. the cylinder of a SDI tester comprises front end end cover, rear end cap, cylinder barrel, piston, air intake opening and gas outlet, and said air intake opening and gas outlet are located on the cylinder barrel; The cylinder barrel two ends are tightly connected with front end end cover, rear end cap respectively, and piston is located in the cylinder barrel slidably, and piston rod one end is connected with piston; Stretch out in the perforate of one of other end the past, rear end cap, piston rod and described perforate are tightly connected, and it is characterized in that; Also comprise sensor; Said sensor is two groups and is installed in the cylinder barrel periphery that wherein one group is arranged on the upper limit that piston satisfies the work of SDI tester, and another group is arranged on the lower limit that piston satisfies the work of SDI tester.

2. the cylinder of a kind of SDI tester according to claim 1 is characterized in that, said piston is provided with sensing element.

3. the cylinder of a kind of SDI tester according to claim 1 is characterized in that, said sensor is an electromagnetic induction sensor.